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Weather in Rancho Cucamonga, United States 🇺🇸

Weather Forecast in Rancho Cucamonga

Current Weather in Rancho Cucamonga

High Surf Advisory issued July 19 at 8:19PM PDT until July 21 at 11:00PM PDT by NWS San Diego CA
Partly cloudy
22°C
Feels like 25°C. Partly cloudy.
🌬️ 4 km/h SW
💧 66% Humidity
🧭 1014 hPa
👁️ 16.0 km Visibility
☀️ UV Index: 0.4
🌡️ Dew Point: 17°C
🌅 Sunrise: 05:53 AM
🌇 Sunset: 08:00 PM
Map Overlays:

In Rancho Cucamonga right now it is 22°C and partly cloudy, feeling like 25°C. Humidity is 66% with winds around 4 km/h, and the UV index is 0 (low). Over the next few days, temperatures in Rancho Cucamonga range from about 20°C to 37°C. ⚠️ High Surf Advisory issued July 19 at 8:19PM PDT until July 21 at 11:00PM PDT by NWS San Diego CA

Hourly Forecast for Rancho Cucamonga

08:00
Sunny
23°
4%
09:00
Sunny
26°
2%
10:00
Sunny
28°
1%
11:00
Sunny
32°
1%
12:00
Sunny
33°
1%
13:00
Sunny
34°
0%
14:00
Sunny
35°
0%
15:00
Sunny
36°
0%
16:00
Partly Cloudy
34°
2%
17:00
Sunny
33°
1%
18:00
Sunny
32°
1%
19:00
Sunny
30°
1%
20:00
Clear
28°
1%
21:00
Clear
26°
1%
22:00
Clear
25°
1%
23:00
Clear
25°
1%
00:00
Clear
24°
2%
01:00
Clear
23°
2%
02:00
Clear
23°
2%
03:00
Clear
22°
2%
04:00
Clear
22°
2%
05:00
Clear
22°
2%
06:00
Sunny
21°
2%
07:00
Sunny
25°
2%

14-Day Forecast for Rancho Cucamonga

Mon, Jul 20
Sunny Sunny
36° / 20°
Tue, Jul 21
Sunny Sunny
35° / 21°
Wed, Jul 22
Sunny Sunny
37° / 22°
Thu, Jul 23
Sunny Sunny
39° / 24°
Fri, Jul 24
Sunny Sunny
38° / 23°
Sat, Jul 25
Sunny Sunny
37° / 23°
Sun, Jul 26
Sunny Sunny
38° / 24°
Mon, Jul 27
Sunny Sunny
39° / 24°
Tue, Jul 28
Sunny Sunny
38° / 23°
Wed, Jul 29
Sunny Sunny
38° / 23°
Thu, Jul 30
Sunny Sunny
39° / 24°
Fri, Jul 31
Sunny Sunny
40° / 23°
Sat, Aug 01
Sunny Sunny
41° / 26°
Sun, Aug 02
Sunny Sunny
41° / 26°

Additional Forecasts for Rancho Cucamonga

Air Quality

💨 US EPA Index 2 (Moderate)
CO (Carbon Monoxide) 159.0 μg/m³
O₃ (Ozone) 40.0 μg/m³
NO₂ (Nitrogen Dioxide) 18.5 μg/m³
SO₂ (Sulphur Dioxide) 3.1 μg/m³
PM2.5 (Fine particles) 16.8 μg/m³
PM10 (Coarse particles) 21.0 μg/m³

Historical Weather

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Best Time to Be Outside in Rancho Cucamonga Today

The most comfortable window in Rancho Cucamonga today looks like 08:00 to 10:00, when it is around 26°C. It should stay dry through that window. No significant rain is expected in the next several hours.

Frequently Asked Questions about Weather in Rancho Cucamonga

What is the temperature in Rancho Cucamonga right now?

The current temperature in Rancho Cucamonga is 22°C (72°F), partly cloudy (feels like 25°C).

What's the weather like in Rancho Cucamonga right now?

Conditions in Rancho Cucamonga right now: Partly cloudy, humidity 66%, wind 4 km/h SW.

What is today's forecast for Rancho Cucamonga?

Today in Rancho Cucamonga: high 36°C, low 20°C, sunny. Chance of rain: 2%.

What is the 7-day weather forecast for Rancho Cucamonga?

Daily highs and lows for Rancho Cucamonga:

  • 2026-07-20: 36°C / 20°C
  • 2026-07-21: 35°C / 21°C
  • 2026-07-22: 37°C / 22°C
  • 2026-07-23: 39°C / 24°C
  • 2026-07-24: 38°C / 23°C
  • 2026-07-25: 37°C / 23°C
  • 2026-07-26: 38°C / 24°C
Is it going to rain in Rancho Cucamonga today?

There is a 2% chance of rain in Rancho Cucamonga today.

What is the wind speed in Rancho Cucamonga right now?

Wind in Rancho Cucamonga is currently 4 km/h (2 mph) from the SW.

What is the UV index in Rancho Cucamonga right now?

The UV index in Rancho Cucamonga is currently 0.4 (low). Sun protection is recommended when the index is 3 or higher.

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